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湖盆水体条件与海盆很不相同,入湖三角洲一般总是以河流能量占主导地位的高建设相三角洲。本文从这一总的前提出发,提出了以坡降大小和距物源区远近为主要因素,对入湖三角洲进行分类的设想。认为入湖三角洲存在两种端点类型:扇三角洲和鸟足状三角洲。陡坡降和沉积中心紧邻物源区形成扇三角洲;缓坡降和远离物源区形成鸟足状三角洲。其它三角洲都是这二者之间的过渡类型。文中根据油田实例,归纳了各类入湖三角洲的主要特征,认为它们之间既有明显区别,又有从属于坡降和距物源区远近变化的过渡演变关系。因此,这样的分类,有利于在湖盆勘探和开发油田时,对三角洲进行有效的预测。
Lake basin water conditions and the basin is very different, into the lake delta is always dominated by river energy in the high-phase delta. Based on this general premise, this paper proposes the idea of classifying lake-entering delta based on the size of slope gradient and the distance from the source area. There are two types of endpoints in the lake: fan-delta and bird-footed delta. The steep slope descent and sedimentary center form the fan delta in the immediate vicinity of the provenance area; the gentle slope descends and forms bird-footed deltas away from the source area. Other deltas are the type of transition between the two. According to the oilfield examples, the main characteristics of various types of lake-forming delta are summed up, and they are considered as distinct from each other. They are also related to the transitional evolution of slope gradient and distance from the source area. Therefore, this classification is conducive to the effective prediction of the delta in the exploration and development of oil fields in the lake basin.